Table 3.

Recovery from mechanical hyperventilation, cough induced hyperventilation (CHV), and isocapnic coughing.

		Compared to ventilator			Compared to cough
Condition	Mean ± SE	Δ (%)	Test	p -value	Δ (%)	Test	p -value
Apnea Duration (s)
Ventilator	40 ± 6	-	-	-	-	-	-
CHV	17 ± 3	−56	T	0.017 ♦	-	-	-
Isocapnia	6 ± 2	−86	M	0.002 ¤¤	−68	W	0.004 ##
Hypopnea Duration (s)
Ventilator	45 ± 8	-	-	-	-	-	-
CHV	63 ± 12	42	T	0.213	-	-	-
Isocapnia	16 ± 5	−64	M	0.039 ¤	−75	W	0.006 ##

Welch’s t-test (T)

^{♦♦♦ =}p < 0.001,

^{♦♦ =}p < 0.01,

^{♦ =}p < 0.05

Mann-Whitney test (M)

^{¤¤¤ =}p < 0.001,

^{¤¤ =}p < 0.01,

^{¤ =}p < 0.05

Wilcoxon singed-rank test (W)

^{### =}p < 0.001,

^{## =}p < 0.01,

^{# =}p < 0.05

CHV/Isocapnia n = 12, Ventilator n = 5.